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Q.

Work function for a metal is 4ev to eject the photo electrons with zero velocity the frequency of the incident light should be

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a

1014Hz

b

1015Hz

c

1012Hz

d

1010Hz

answer is B.

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Detailed Solution

λ=124004A0=3100λ0 ,ν=cλ =3X1083100X10−10Hz =331X1016=1015Hz
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Work function for a metal is 4ev to eject the photo electrons with zero velocity the frequency of the incident light should be